Pipe handling device

ABSTRACT

An automatic pipe handling device ( 10 ) is disclosed which includes a support frame ( 12 ) mounted on a boring device ( 14 ). Removable pipe racks ( 16, 80, 130, 140 ) can be placed in position on the support frame ( 12 ) to deliver pipe to the spindle axis or to remove pipe therefrom as required. The pipe sections are removed from the pipe rack and positioned on the spindle axis by pipe grippers ( 32 ) mounted on hydraulic cylinders ( 28, 30 ) mounted on a rotating longitudinal shaft ( 20 ). The grippers and shaft similarly return the used pipe sections for storage to the pipe rack. In one pipe rack ( 16 ) an S-shaped guide path ( 72 ) is used. In another pipe rack ( 80 ) a plurality of rows ( 88, 90, 92 ) of pipe sections are used. 
     In another embodiment, pipe is stored in an arcuate path. Pipe grippers ( 32 ) may be pivoted to any selected position along the arc extending from a first position ( 178 ) for connecting to or receiving pipe from the boring device, to a final position ( 180 ) where the pipe grippers ( 32 ) are positioned to pick up the last pipe in the arc. 
     In another embodiment, pipe is stored in a self-leveling arrangement beneath a pipe loader ( 256 ). The pipe loader is mounted on a rotation member ( 236 ) which, in combination with extension cylinders ( 244 ), rotates and extends pipe grippers ( 256 ) to access any selected pipe section stored in the self-leveling arrangement. 
     In another embodiment, pipe sections ( 18 ) are stored horizontally in columns ( 430 ) above a pipe handling assembly ( 416 ) which shuttles pipe sections between the boring device and the storage area. The pipe handling assembly ( 416 ) has arms which extend and retract between the spindle line of the boring device and the columns of pipe sections.

CROSS REFERENCE TO RELATED APPLICATION

This application is a continuation of application Ser. No. 08/624,240, filed Mar. 29, 1996 now U.S. Pat. No. 6,085,852 which is a continuation-in-part of patent application Ser. No. 08/532,354 filed on Sep. 22, 1995, now abandoned which was a continuation-in-part of application Ser. No. 08/392,072 filed on Feb. 22, 1995, now abandoned and the entire contents of both of these applications are incorporated herein by reference.

FIELD OF THE INVENTION

This invention relates to the handling of pipe for a horizontal boring device or other machine using or requiring the receipt of pipe in a generally horizontal position.

SUMMARY OF THE INVENTION

The present invention is directed to a pipe handling device for storing and transporting pipe sections to and from a horizontal boring machine, the horizontal boring machine comprising a spindle for connecting a drill string to the horizontal boring machine. The pipe handling device comprises a magazine and a pipe handling assembly. The magazine is adapted to store a plurality of pipe sections near the horizontal boring machine. The pipe handling assembly is adapted to transport at least one pipe section between the magazine and the horizontal boring machine. The magazine further is adapted to passively position the plurality of pipe sections in the magazine for transport to the horizontal boring machine.

The present invention is further directed to a horizontal boring machine comprising a spindle for connecting a drill string to the horizontal boring machine and further comprising a pipe handling device. The pipe handling device stores and transports pipe sections to and from the horizontal boring machine and comprises a magazine and a pipe handling assembly. The magazine is adapted to store a plurality of pipe sections near the horizontal boring machine. The pipe handling assembly is adapted to transport at least one pipe section between the magazine and the horizontal boring machine. The magazine further is adapted to passively position the plurality of pipe sections in the magazine for transport to the horizontal boring machine.

Finally, the present invention is directed to a machine requiring receipt of elongate objects in a generally horizontal position. The machine comprises a handling device for storing and transporting elongate objects to and from the machine. The handling device comprises a magazine and a handling assembly. The magazine is adapted to store a plurality of elongate objects near the machine. The handling assembly is adapted to transport at least one elongate object between the magazine and the machine. The magazine further is adapted to passively position the plurality of elongate objects in the magazine for transport to the machine.

BRIEF DESCRIPTION OF THE DRAWINGS

For a more complete understanding of the present invention and for further advantages thereof, reference is now made to the following description of the preferred embodiments, taken in conjunction with the accompanying drawings.

FIG. 1 is a perspective view of an automatic pipe handling device forming a first embodiment of the present invention.

FIG. 2 is a partial cross-sectional view of taken along view A in FIG. 1.

FIG. 3 is a perspective view of a modified pipe rack for use with the device.

FIG. 4 is a side elevational view in cross-section of the pipe rack of FIG. 3.

FIG. 5 is a detail view of the rack of FIG. 4 illustrating the rubber straps cushioning the pipe section movement.

FIG. 6 is a partial cross-sectional view of the pipe rack of FIG. 3.

FIG. 7 is a partial cross-sectional view of a modification of the pipe rack of FIG. 3.

FIG. 8 is a perspective view illustrating another modification of the automatic pipe handling device.

FIG. 9 is an end view of the device of FIG. 8.

FIG. 10 is an exploded view of a portion of the device of FIG. 8.

FIG. 11 is an exploded view of a pipe loader used in a pipe handling device forming a modification of the invention.

FIG. 12 is a side view of the extension frame of the pipe loader.

FIG. 13 is an end view of the extension frame.

FIG. 14 is a schematic view of hydraulic circuits in the device.

FIG. 15 is a plan view of the pipe box used in the device.

FIG. 16 is a side view of the pipe box.

FIG. 17 is an end view of the pipe box.

FIG. 18 is a perspective view of a cylinder mount and rotation member mounted thereon for limited pivotal motion.

FIG. 19 is a plan view of a pivot adjust stop.

FIG. 20 is a plan view of the rotation arm.

FIG. 21 is an end view of the rotation arm.

FIG. 22 is a perspective view of the end panel on the pipe box.

FIG. 23 is an exploded perspective view of another preferred embodiment of the pipe handling device of the present invention.

FIG. 24 is a partly cross-sectional end view of the magazine and pipe handling assembly of FIG. 23.

FIG. 25 is a fragmen ted, end view of the pipe handling device of FIG. 23 receiving a pipe section from the magazine.

FIG. 26 is a fragmented, end view of the pipe handling device of FIG. 23 receiving a pipe section from the spindle axis of a horizontal boring machine.

FIG. 27 is a fragmented, end elevational view of the pipe handling device of FIG. 23 in the auxiliary load position.

FIG. 28 is a side elevational view of the pipe handling device of FIG. 23 and shows the placement of rollers for preventing axial sliding of pipe sections during transport between the horizontal boring machine and the magazine.

FIG. 29 is a side elevational view of the pipe handling device of FIG. 23 showing the operation of the pipe return assembly.

FIG. 30 is a plan view of the pipe handling device of the present invention showing the operation of the pipe return assembly.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

In recent years, many utility lines have been laid or replaced by use of a horizontal boring machine which eliminates the need to dig a trench from the surface to install or replace the utility. This technique has generally come to be known as trenchless technology.

In a typical horizontal boring machine, a bore hole is formed with a steerable bit. The boring machine is mounted at the surface. One hydraulic motor on the boring machine causes the drill bit and drill string to rotate while another thrusts the drill bit and drill string forward as the bore is formed. It is also common to backream the bore with the machine, rotating a backreaming tool while drawing back the drill string to the boring machine.

The drill string is formed of a plurality of individual drill string sections threaded together. As the machine initially bores the hole, additional drill string sections must be added or “made up” as the bore is lengthened. Similarly, when backreaming the bore, the individual drill string sections must be removed or “broken out.”. Traditionally, making up and breaking out drill string sections has been done by hand, with the assistance of wrenches on the drilling machine. There has also been a requirement to store the individual drill string sections before and after use.

The typical horizontal boring device requires a three member crew. To increase efficiency and reduce cost, it would be of great benefit to provide an automated system for making and breaking drill pipe sections automatically during operation. Ideally, this would eliminate the need for a third person in the operation and permit the boring machine to be operated with a crew of two. In addition to an increase in efficiency and reduction of cost, eliminating the use of an individual to manhandle the drill pipe sections would reduce the chances for injury.

The Embodiment of FIGS. 1 and 2

With reference now to FIGS. 1 and 2, an automatic pipe handling device 10 is illustrated which forms a first embodiment of the present invention. The device includes a support frame 12 which is permanently attached to the drill rig 14. The drill rig 14 is not illustrated in its entirety as it is a conventional and well known device. A pipe rack 16 is removably attached to the support frame 12 to store pipe sections 18 (see FIGS. 4, 5 and 6) when not in use by the drill rig.

The support frame 12 mounts a longitudinal shaft 20 which is mounted for rotation about an axis 22 which is parallel to the spindle axis 24 of the drill rig 14. The spindle axis 24 is the axis along which the drill string extends and is the axis of rotation of the drill string at the drill rig. To insert a pipe section 18 within the drill string, or remove the pipe section, the pipe section must be laid along the spindle axis 24 or removed from the spindle axis 24.

The longitudinal shaft 20 is rotatable by a hydraulic drive motor 26. Two hydraulic cylinders 28 and 30 are mounted along the length of the shaft 20 and are mounted perpendicular to the axis 22. At the end of the piston of each of the cylinders 28 and 30 is mounted a spring loaded pipe gripper 32. Grippers 32 include fixed fingers 33 and spring loaded fingers 35 urged to grip the pipe section by springs 37. The grippers 32 include guide shafts 34 which slide within brackets 36 mounted on the cylinders 28 and 30 so that the movement of the pipe grippers is only along an axis 31 perpendicular to the axis 22.

The pipe rack 16 is formed of a frame weldment 38 including an upper bracket 40, a lower bracket 42 and side plates 44 and 46. Bars 60 and 62 extend between the side plates as well. Each side plate mounts a lifting eye 48 and is provided with aperture 50 to attach the pipe rack 16 to the support frame 12. An elongated aperture 57, located on bracket 56 of support frame 12, engages tab 59 located on the base of pipe rack 16 as the pipe rack is loaded onto support frame 12. Pins 52 are inserted through apertures 54 in brackets 56 on the support frame 12 and through the apertures 50 in the side plates 44 and 46. The pins 52 have a through hole to receive a locking clip 58 to secure the pipe rack on the support frame despite vibration or movement of the boring machine. However, the pipe rack 16 can be relatively easily removed from the support frame 12 by removing the pins and lifting the pipe rack off the frame.

Near each end plate of the pipe rack is mounted a labyrinth track 64 which cooperates with a guide 66 mounted on the inside surfaces of the side plates to form an S-curve path 72 to guide drill pipe within the pipe rack from a return position 68 formed at the top of the pipe rack to a pick up position 70 formed at the bottom of the pipe rack. Attached to each end plate is a guide strip made from a low friction plastic such as UHMW (Ultra High Molecular Weight) plastic, to permit the use of shoulderless pipe in the pipe rack.

Assuming that pipe sections are to be added to the drill string and are presently stored in the pipe rack 16, the pipe rack will first be attached to the support frame 12. The drive motor 26 will then be activated to cause the longitudinal shaft 20 to pivot so that the spring loaded pipe grippers 32 are facing the pipe section at the pick up position 70. The hydraulic cylinders 28 and 30 are activated to extend the pistons thereof so that the pipe grippers 32 move against and over the pipe at the pick up position. The hydraulic cylinders 28 and 30 are then retracted, drawing the pipe section from the pick up position and out of the pipe rack. The hydraulic drive motor 26 is then again activated to pivot the longitudinal shaft 20 until the pipe grippers 32 are directed toward the spindle axis 24. The hydraulic cylinders 28 and 30 are again activated to extend the pipe grippers to position the pipe section along the spindle axis 24. The mechanisms of the horizontal boring machine, not shown, then thread the pipe section into the drill string. After the pipe section is threaded, the cylinders 28 and 30 are retracted, pulling the pipe grippers 32 off the pipe section just inserted in the drill string.

If a plurality of pipe sections are stored in the pipe rack 16, when the pipe section in the pick up position 70 is removed by the pipe grippers, the remaining pipe sections 18 in the pipe rack, guided by the S-curve path 72 formed between the labyrinth track 64 and guides 66 at each end of the pipe rack, will move via gravity to urge the next pipe section in line into the pick up position 70. In this manner, each of the pipe sections in the pipe rack 16 can be removed individually from the pipe rack and positioned on the spindle axis 24 to be made up as part of the drill string. Block plates 74 on each of the side plates prevent the pipe section in the pick up position 70 from simply falling out of the pipe rack.

When the boring has been completed, and pipe sections are to be removed from the drill string, the device works essentially in reverse. The longitudinal shaft 20 will be pivoted by hydraulic drive motor 26 to grasp a pipe section 18 on the spindle axis 24. However, instead of being pivoted to the pick up position 70, the longitudinal shaft 20 is rotated by hydraulic drive motor 26 so that the pipe grippers 32 face the return position 68. The hydraulic cylinders 28 and 30 are then extended to move the pipe section 18 into the return position 68. The shaft 20 will then be rotated slightly to move the pipe section inside a portion of the tracks 64 so that when the hydraulic cylinders 28 and 30 are retracted, the pipe section will be held in place by the track plus the end guides 64 and the pipe grippers 32 will be removed from the pipe section.

Alternatively, a reverse stop 65 (see FIG. 4) can be mounted on the pipe rack which pivots out of the way to allow the pipe section to be inserted in the return position but then pivots back by gravity to block the pipe section from falling out of the pipe rack. Once removed, the pipe section will fall by gravity along the S-curve path 72 between the tracks 64 and guides 66 until it contacts the next previous pipe section inserted into the pipe rack. As pipe sections are removed from the drill string, these steps can be repeated until the pipe rack is completely full of pipe sections and ready to be used again to form another bore. If the drill string contains more pipe sections than pipe rack 16 can hold, the full rack is simply removed and replaced by an empty rack to continue the process.

If heavier pipe sections are used, the spring loaded pipe grippers 32 can be replaced by pipe grippers actuated by hydraulic cylinders.

A detent device 73 on one end of the shaft 20 can assist in indexing the shaft in the positions described above.

The use of the S-curve path and the end guides permit straight, shouldered, bottlenecked, shoulderless or any other style of pipe sections to be used. A number of rubber straps 126 can be mounted within the pipe rack 16 to slow the fall of pipe sections within the rack as seen in FIG. 5.

The sequence of operations of the device illustrated in FIGS. 1 and 2 would be for the load sequence to move pipe sections from the rack to the drill string:

1. extend grippers toward pick up position of rack;

2. grip pipe section in pick up position;

3. retract grippers to remove gripped pipe section from pick up position;

4. rotate grippers with pipe section toward spindle axis and extend grippers;

5. retract grippers to release grippers from pipe section;

6. rotate to pick up position; and

7. extend grippers to next pipe section.

The unload sequence moving pipe sections from the drill string to storage in the rack would be as follows:

1. rotate grippers to spindle center line;

2. extend grippers to grip pipe section to be removed from drill string;

3. rotate grippers and removed pipe section to the return position; and

4. retract grippers from pipe section in return position of rack.

The pipe section will then fall by gravity to the pick up position through the S-curve path.

The Embodiments of FIGS. 3-5

With reference now to FIGS. 3 and 4, a modified pipe rack 80 will be described. The pipe rack 80 includes a number of elements identical to the pipe rack 16 (FIGS. 1 & 2), including brackets 40 and 42, side plates 44 and 46, lifting eyes 48, apertures 50 and bars 60 and 62. It will be clear from this that pipe rack 80 can be mounted directly on the support frame 12 as a replacement for or substitute for the pipe rack 16, and pipe racks 16 and 80 are completely interchangeable.

Pipe rack 80 has an outer track 82, an intermediate track 84 and an inner track 86 mounted on the inside of each of the side plates 44 and 46. The pipe rack 80 defines a return position 104 and pick up position 96. A first vertical row 88 is formed between track 82 and track 84. A second vertical row 90 is formed between the intermediate track 84 and the inner track 86. A third vertical row 92 is formed between the inner track 86 and a guide 94 extending from the upper bracket 40 downward toward the lower bracket 42 and then forward to the pick up position 96 at the bottom front of the pipe rack. Block plates 98 are mounted on the plates to prevent pipe sections in the pipe rack from falling out because of gravity.

Manual upper row selectors 100 and 102 (seen in FIG. 4) can be positioned to select which row a pipe section will enter after being placed in the return position 104. The manual upper row selectors 100 and 102 are located at each end of the pipe rack 80 at a pivot point 100 c. Selector 100 selects the third vertical row 92 and rests, when in the receiving position (as seen in FIG. 4), on stop 100 d. Selector 102 selects the second vertical row 90 and rests on stop 100 e. The first vertical row 88 is selected by rotation of both manual upper row selectors 100 and 102 about pivot points 100 c and into a position as shown at 100 f (where selector 102 is shown in FIG. 4). The top of the rack is open at the position of selectors 100 and 102 so that, for example, selector 100, seen in FIG. 4 in the receiving position, can be pivoted clockwise about pivot 100 c into position 100 f beside the position of upper row selector 102 seen in FIG. 4. Both of the selectors 100 or 102 at each end of the pipe rack must be selected in order for the pipe to enter the desired vertical row. If selector 100 is selected at one end of the pipe rack and selector 102 is selected at the opposite end, the pipe will attempt to enter the second vertical row 90 and the third vertical row 92 simultaneously and become jammed. Preferably, as pipe sections are returned, the third row 92 will be filled up first, next the second row 90 and finally the first row 88.

Near the bottom of the pipe rack 80 are mounted gate rods 106 and 108 which extend the entire length of the pipe rack and are supported by the side plates for limited pivotal motion. Handles 110 and 112 (seen in FIG. 3) are mounted on gate rods 106 and 108, respectively, to permit manual pivotal motion of the rods. Mounted along gate rod 106 are a pair of gates 114. In the position shown in FIG. 4, the gates 114 prevent pipe sections from moving out of the third row 92 into the pick up position 96. Gates 114 can be seen to have an arcuate end 116 to engage the lowermost pipe section in the third row. When the pipe sections in the third row 92 are to be used, the handle 110 is manually moved to pivot rod 106 so that the gates 114 move in a direction away from the block plates 98 (counter-clockwise in FIG. 4), permitting the pipe sections in the third row to fall onto the guide 94 for movement into the pick up position 96 by gravity. Gates 114 can be seen to have an actuate side 118 which assists the movement of the pipe sections to the pick up position.

Gate rod 108 similarly supports a pair of gates 120 which can be used to prevent pipe sections from the second row from moving into the pick up position 96. Gates 120 have a convex surface 122 which engages the pipe sections in either the second row or those pipe sections permitted to pass gates 114 from the third row to prevent the pipe sections from moving into the pick up position. However, if pipe sections from the second or third rows are to be permitted to move to the pick up position, the handle 112 can be moved to pivot the rod 108 away from the block plates 98 (counterclockwise in FIG. 4) to move convex surfaces 122 out of engagement with the pipe sections. Gates 120 have actuate sides 124 to facilitate movement of the pipe sections by gravity into the pick up position.

Either handle 110 or 112 can be manipulated to stop supply of pipe sections from the second or third rows even before the rows have been emptied by moving the respective gate at least part way back to the blocking position until the pipe sections between the gates and the pick up position have been moved out of the pipe rack and then moving the gates to the final blocking position, as seen in FIG. 4.

A number of rubber straps 126, as seen in FIGS. 4 and 5, can be mounted within the pipe rack 80 to slow the fall of pipe sections within the rows to prevent pipe damage.

The pipe rack 80 has the same volume of space as the pipe rack 16 but will carry a greater number of pipe sections. In operation, pipe sections are delivered to the return position 104 and directed by the manually positioned selectors 100 and 102 to one of the three vertical rows 88, 90, and 92. Gravity propels the pipe section to the bottom of the row. When removing pipe from the rack, the selection of a particular row to be used is accomplished by the manual rotation of the handles 110 and 112 as noted. The first row 88 connects directly with the pick up position 96 and has no gates associated therewith. After the pipe sections in the first row 88 are used, it is preferable to move handle 112 to permit the pipe sections in the second row 90 to next be used. Finally, the handle 110 is activated to allow the pipe sections in the third row 92 to be used. When all rows are emptied, the emptied pipe rack 80 can be off loaded from the support frame 12 and a full rack installed. The process is reversed when performing a backreaming or pullback function.

The Embodiments of FIGS. 6-7

FIG. 6 is a cross-sectional view of a pipe rack 130 which is a modification of pipe rack 80. Pipe rack 130 is identical with pipe rack 80 with the exception of the use of gates 132 and 134 which each have convex ends 136 to engage the pipe sections in the second and third rows to prevent them from moving to the pick up position.

FIG. 7 is a cross-sectional view of a pipe rack 140 which is a modification of pipe rack 80. In pipe rack 140, only two rows, rows 142 and 144 are used. This requires the use of only a single pair of gates 146 with convex ends 148.

FIGS. 6 and 7 permit the location of the positioning and gripper location in a new position or several different positions 150, 152, 154 in the case of FIG. 6 and 156 and 158 in the case of FIG. 7 to permit the loading and carrying of a greater number or quantity of drill pipe.

For the embodiment shown in FIGS. 3-7, the loading sequence to load pipe sections from the rack to the drill string would be as follows:

1. extend gripper to pick up position in rack;

2. pick up pipe section in pick up position;

3. retract grippers and gripped pipe section;

4. rotate grippers and gripped pipe section to spindle center line;

5. retract grippers after pipe section is threaded into drill string; and

6. rotate grippers to pick up position to pick up next pipe section.

To remove pipe from the drill string and return it to the rack the unloading sequence would be:

1. rotate grippers to spindle center line;

2. extend grippers to grip pipe section to be removed from drill string;

3. rotate grippers and gripped pipe section to return position in rack; and

4. retract gripper from pipe section.

The pipe sections will fall by gravity to the pick up position through the vertical rows.

The Embodiments of FIGS. 8-10

With reference now to FIGS. 8 and 9, an automatic pipe handling device 160 forming a second embodiment of the present invention is illustrated. The device 160 is mounted on drill rig 14 by bolting to a pair of brackets 164 on the drill rig frame. Plates 162, in turn, mount pipe rack brackets 166. A hydraulic motor 168 is bolted to the drill rig and rotates a longitudinal shaft 170 about an axis 172 which is parallel to the spindle axis 24. Mounted along the longitudinal shaft 170 are a pair of hydraulic cylinders 28 and 30 as used in device 10, including spring loaded pipe grippers with fixed fingers 33 and spring loaded fingers 35.

Each of the pipe rack brackets 166 can be seen to define an arcuate path 172 with a closed lower end 174 and an open upper end 176. The actuate path 172 and the pipe rack brackets 166 combine to form a curved row to receive and store pipe sections 18. In the particular case illustrated in FIGS. 8, 9 and 10, the pipe rack is capable of storing ten pipe sections.

As will be apparent from FIGS. 8 & 9, the hydraulic motor 168 is capable of pivoting the longitudinal shaft 170 to position the spring loaded pipe grippers at any selected position along an arc extending from a first position 178 for installing and retrieving pipe sections from the spindle axis 24 to a final position 180 where the pipe grippers are positioned to pick up the very last pipe section in the pipe rack.

With reference to FIG. 8, if the operator begins with a full rack of pipe sections, the cylinders 28 and 30 are activated to retract the pipe grippers and the hydraulic motor 168 pivots the longitudinal shaft to position the pipe grippers in the pick up position 182 adjacent the first pipe section in the pipe rack. The cylinders 28 and 30 are then activated to extend the pipe grippers to grip the first pipe section in the pipe rack. The hydraulic motor 168 is then activated to pivot the longitudinal shaft 170 and pivot the pipe grippers and gripped pipe section into the first position 178, where the pipe section will be centered on the spindle axis 24 to be threaded into the drill string. Once threaded into the drill string, the cylinders 28 and 30 can be activated to retract the pipe grippers away from the pipe section. The hydraulic motor is then activated to pivot the longitudinal shaft 170 to position the pipe grippers adjacent the next pipe in the pipe rack. The pipe grippers will then be extended by cylinders 28 and 30 to grasp the next pipe and hydraulic motor 168 will be activated to move that pipe section into alignment with the spindle axis 24. As can be understood, the device will operate to remove each pipe section in sequence held on the pipe rack until the final pipe section at the final position 180 is delivered for insertion in the drill string.

As the drill string is being disassembled, the operation of the device 160 is simply reversed. The pipe grippers will grip the first section of pipe at the spindle axis 24 and can move it to the next open position along arcuate path 172 on pipe rack brackets 166 for storage before retracting the cylinders 28 and 30 to move the pipe grippers out of engagement with the pipe section. The operation will continue until all the pipe sections have been replaced in the pipe rack.

The loading sequence of operation for the device illustrated in FIGS. 8-9 will be for putting pipe sections in the drill string:

1. extend grippers to top most pipe section in rack;

2. pick up top most pipe section in rack;

3. rotate grippers and gripped pipe section to spindle center line to install in drill string;

4. retract grippers; and

5. rotate grippers to next top most pipe section in rack and repeat above sequence.

To remove pipe sections from the drill string and return them to the rack the unloading sequence would be:

1. rotate grippers to spindle center line;

2. extend grippers to grip pipe section in drill string to be removed;

3. rotate grippers and gripped pipe section to deposit the pipe section on top of the top most pipe section already in the rack, or the bottom of the path 172 if this is the first pipe section being returned;

4. retract grippers; and

5. rotate grippers to spindle center line to pick up next pipe section to be removed from the drill string.

With this device, the pipe sections are not dropped by gravity but are placed on top of the previously positioned pipe section or, if the first pipe section in the rack, at the bottom of the path 172.

It will be appreciated that the adjustment plates 164 have elongated bolt holes 184 which will permit some adjustment of the position of the pipe rack brackets 166 relative to the drill rig 14 and the spindle axis 24. As seen in FIGS. 9 and 10, a stow lock 187 is pivotally mounted on each of the pipe rack brackets and can be pivoted over the open upper end 176 of each bracket and pinned in that position by pins 188. This will prevent inadvertent removal of the pipe sections during transport of the drill rig.

The hydraulic motor 168 does not specifically index the pipe grippers to any pick up position or return position. The pipe sections are, however, picked up from the top of the pipe rack brackets near the open upper end 176 to the bottom of the pipe rack brackets near the closed lower ends 174 in sequence and are returned in opposite order. It is preferable to move the pipe section along the arcuate path 172 and into contact with the next adjacent pipe section in the rack before removing the grippers to avoid allowing the pipe sections to fall by gravity along the arcuate path.

The device of the present invention can be operated by a single individual with only two controls. The first control will operate the hydraulic drive motor 26 or 168 and the second control will operate the hydraulic cylinders 28 and 30 to grab the pipe sections with the pipe grippers 32. The device therefore permits the operator to automatically move drill pipe from the pipe rack carried on the boring device to the spindle center line as the drilling progresses. After completion of the pilot bore and while backreaming and pulling back services, the device will automatically unload the drill pipe from the spindle center line and return the drill pipe to the pipe rack. By designing the pipe racks to be readily installable on and removable from the support frame 12, as many pipe sections as required can be quickly provided. This design permits the number of people in an operating crew for the boring machine to be reduced from three to two.

The device also improves the function, productivity and safety of the drill rigs used by the guided boring industry. The operator, by moving two hydraulic valve levers, has complete control of the pipe loading and unloading operation. The device is easily understood and easy to operate. The operator can remain at the console to operate the device. The smoothness of the operation permits the operator to load and unload drill pipe at the spindle very efficiently. This improved smoothness and efficiency results in less time spent adding to and removing drill pipe from the drill string, thus reducing time spent on the job. The mechanical device removes the need for another person on the crew to remove drill pipe from a pipe box and load or unload at the spindle. The safety aspects of the device remove the possibility of injury by eliminating the need to lift and load the drill pipe by hand and eliminating the need for an additional crew member to lift and load the drill pipe.

The Embodiments of FIGS. 11-22

With reference now to FIGS. 11-22, a pipe handling device 200 forming another embodiment of the present invention is illustrated. With reference to FIGS. 15-17, the device includes a pipe box 202 for storage of pipe sections 18. Pipe box 202 is mounted to the drill rig 14 at mounting points 204 and 206 so that the elongate axis 208 of the pipe box is parallel to the spindle axis 24. The pipe box includes a rectangular bar 210 with bottom plates 212 mounted thereon near each end of the bar.

Side plates 214 and 216 extend upwardly from either side of the bottom plates and an end plate 218 connects the upper ends of the side plates at each end of the box. Preferably, corner plates 220 (FIG. 17) are mounted between the bottom plate and each of the side plates, as seen in FIG. 17. The distance X between the side plates is sufficient to accommodate a number of pipe sections 18 side by side, for example, three or four.

The pipe sections are preferably stored in a stack determined manner. For example, the lowest row may be three pipe sections side by side. The next or second row on top will be four pipe sections wide, with the outer pipe sections of the second row naturally fitting between the side walls and the outer pipe sections just below in the lowest row. The inner pipe sections on the second row naturally fit between adjacent pipe sections in the lowest row. The third row would then be three pipe sections wide, fitting between adjacent pipe sections in the second row.

Such a configuration is illustrated in FIG. 17. Simply put, as a pipe section is placed in the pipe box on pipe sections already there, it will naturally pick a stable position nested between adjacent pipe sections in the next lower row or between a side wall and the pipe section adjacent the side wall in the next lower row. The height Y of the box is sufficient to accommodate a number of pipe sections vertically, for example, eight.

In one embodiment, the pipe sections are held in alternating rows of three and four pipe sections from the bottom to the top of the box along the Y direction. The pipe sections can enter and leave the box through the top of the pipe box between the side plates and end plates. The side plates prevent the pipe sections from rolling out of the box. The bottom plates support the lowest row of pipe sections. Typically, the pipe sections used will be of a type having upset ends, that is ends that have a larger diameter than the intermediate portions of the pipe sections, providing sufficient space between each pipe section for the pipe section to be gripped in a manner discussed hereinafter.

As seen in FIG. 22, removable end panels 219 at either end of pipe box 202 normally hold the pipe sections from falling out the ends of the pipe box, but can be removed by lifting out retaining pin 221 to allow access for removal of thread and dust protective caps (not shown) typically installed on the ends of each pipe section 18. The bottom end panel 219, for the lower end of pipe box 202 when it is installed on an inclined boring unit 14, is offset and reversible. Once reversed, the offset restrains the pipe sections 18 from sliding down toward the lower end of box 202 after the protective caps are removed. When the bore is completed and the pipe box 202 is ready for transport from the job site, the end panels can be removed for installation of the protective caps. Bottom panel 219 is now reversed to its original (storage) position to clear the added length of the protective caps.

With reference to FIGS. 11-14, the device 200 also includes a pipe loader 222 which is mounted on top of the pipe box 202 and secured thereto. The pipe loader includes a rear pivot mount 224 and a front pivot mount 226. With reference to FIGS. 15 and 18, pivot mount 224 can be seen to have vertical rods 228 at each side thereof which extend downwardly and are received within sockets 234 mounted on side plates 214 and 216 at the rear of the pipe box. Similarly, the front pivot mount has rods 232 which mount through sockets 230 on the side plates 214 and 216 at the front of the pipe box.

A rotation member 236 is mounted between the pivot mounts 224 and 226 to pivot about pivot axis 238 which, when the pipe box 202 is mounted on the drill rig, and the pipe loader 222 is mounted on the pipe box, is also parallel the spindle axis 24. Mounted along the rotation member 236 are a pair of lifting eyes 240 which permit the pipe loader 222 to be lifted off of the pipe box. It is preferable to do so before the pipe box is detached from the rig.

Also mounted on rotation member 236 are a pair of cylinder mount tubes 242 which each mount a double acting extension cylinder 244. A pair of guide tubes 246 are also mounted on the rotation member and receive the guides 248 of an extension frame 250. The ends of the pistons of extension cylinders 244 are mounted to the extension frame at points 251.

At each end of the extension frame is mounted a pipe gripper 256 which includes a fixed finger 258 and pivoting finger 260. The finger 260 is pivoted by the piston of a double acting gripper cylinder 262. The cylinder 262 is supported on the extension frame 250 at the outer ends of the cylinder supports 252 and 254 mounted to frame 250.

With reference to FIGS. 18-21, the rear end of the rotation member 236 has a pair of stop pins 264 mounted thereon. A pivot adjustment stop 266 is mounted to the rear pivot mount 224 by bolts. The bolt holes 267 in the stop allow for limited pivotal motion about the axis 238 before tightening the bolts. The pivot adjustment stop has stop surfaces 268 and 269 which engage the stop pins 264 to confine the pivotal motion of the rotation member to a predetermined angle, for example 65 degrees.

A double-acting pivot cylinder 270 is pivotally mounted to the rear pivot mount 224 on pivot 272. The piston 276 of cylinder 270 is pivotally mounted to one end 277 of a rotation arm 278. The other end of rotation arm 278 has a pin 279 extending in the end of rotation member 236 which is secured to the end of the rotation member 236 by a key. Thus, extension and retraction of the piston 276 within the cylinder 270 will cause pivotal motion of the member 236 between the limits permitted by the pivot adjustment stop 266.

With reference to FIG. 14, the hydraulic connections in the pipe handling device 200 can be described. The hydraulics will normally be powered from a hydraulic pump on an accessory power system (not shown), but can be powered from another source. Also, hydraulic operation can be replaced by compressed air operation or other suitable drive mechanism.

A control valve assembly 280 is provided which includes at least three control valves 282, 284 and 286 controlled respectively by control handles 288, 290 and 292. Valve 282 is connected through lines 294 and 296 to the double-acting rotation or pivot cylinder 270. The lines 294 and 296 pass through a check valve unit 298. Thus, activation of the handle 288 in opposite directions will cause the piston of cylinder 270 to extend and retract, pivoting the rotation member with the pipe grippers mounted thereon. When the rotation member has been pivoted to the desired position, the check valve 298 will maintain the member in that position when the handle is released.

Lines 300 and 302 extend from the valve 284 to the double-acting extension cylinders 244 to extend or retract the extension frame 250 relative the rotation member 236. A check valve 304 is utilized to maintain the position of the extension frame 260 after lever 290 is released. A flow divider 306 is preferably utilized to insure uniform motion of the pistons in the cylinders 244 so that the extension frame 250 does not jam as it is moved relative the rotation member 236.

Lines 308 and 310 extend from the valve 286 to the gripper cylinders 262. Thus, activation of the handle 292 will alternatively open the grippers or close the grippers about a pipe section. A check valve 312 maintains the position of the grippers when the handle is released.

The pipe handling device 200 enables the operator to move pipe joints or segments from the pipe box 202 to the drill unit for the purpose of adding pipe segments to the drill string as the boring operation progresses. Once the initial boring process or pilot bore is complete, the pipe handling device 200 enables the operator to sequentially remove pipe from the drill string and return it to the pipe box 202.

When boring or drilling the initial pilot hole with the drill unit, the operator must sequentially add more drill pipe segments to the drill string as it advances in the ground. This involves operations known in the art such as drilling forward, breaking connection with the drill string, retracting the drill unit carriage, adding another pipe segment to the drill string, and resuming the boring process. The pipe handling device 200 assists in the operation of obtaining and positioning the added pipe segments so that it can be threaded into the drill string. Once the bore is completed, the pipe handling device 200 assists in the operation of moving the pipe segments back to the pipe box.

In the drilling process, to load another pipe, the operator operates the three valves 282, 284 and 286 in sequence or in combination. The pivot cylinder 270 is used to rotate the rotation member and pipe grippers toward the desired pipe section in the pipe box. The extension cylinders 244 are used to telescope the extension frame 250 with the pipe grippers toward the selected pipe segment within the pipe box. The gripper cylinders 262 are actuated to close the gripping fingers 258 and 260 around the selected pipe section. The device can grasp any pipe section in the top row of the pipe box, although the operator will generally choose the one most accessible, typically the one closest to the drill unit. The stroke of extension cylinders 244 will be long enough to grasp pipe sections at the bottom of the pipe box.

Once the pipe section is gripped, it is moved above the pipe box by a combination of rotation of the member 236 by the pivot cylinder 270 and retraction of the extension cylinders 244 so that the pipe section at least clears the top of the side plates. With the pipe section now above the pipe box, the pivot cylinder 270 is actuated to pivot the rotation member into alignment with the spindle axis 24. This alignment can be set by the pivot adjustment stop 266.

Assuming the drill unit is ready to receive another pipe section, the operator can extend the extension cylinders 244 to move the gripped pipe section into coincidence with the spindle axis 24. The operator then moves the carriage of the drill unit forward so that the spindle engages the top hole end of the pipe section and begins to rotate the spindle to thread the connection together. Then the spindle is advanced, sliding the pipe section through the grippers to engage the other end of the pipe section with the drill string, and make that connection.

The gripper cylinders 262 are then actuated to release the pipe section and the extension cylinders are actuated to move the extension frame 250 away from the installed pipe section. The pivot cylinder 270 can then pivot the rotation member 236 to pick up the next pipe section in the pipe box. If the bore is longer than the amount of pipe in the pipe box, the pipe loader 222 can simply be released from and lifted off the empty pipe box and a loaded pipe box is substituted. The pipe loader 222 can then be lowered onto and secured to the full pipe box to continue the drilling operation.

The unloading process is essentially the reverse of the loading process. The pipe box will be at least partially empty. The carriage on the drill unit is moved back to pull the drill string from the hole, and the first pipe section in the drill string is broken free of the string. The pipe handling device 200 is positioned so that the pipe grippers 256 will engage that pipe section. This engagement can be done before the threaded connections are broken or after.

The carriage is moved back enough to disengage the bottom threads of the pipe section, if necessary, sliding the pipe section through the grippers a short distance. The spindle is further rotated and retracted to disengage from the top end of the pipe section. Then the operator can move the pipe section back to the pipe box in the reverse motion from installation. This is done first by retraction of the extension cylinders 244 and followed by actuation of the pivoting cylinder 270 to pivot the rotation member and suspend the pipe section above the pipe box.

The extension cylinders 244 are then extended to lower the pipe section into the box to the position selected by the operator. The gripper cylinders 262 are actuated to release the pipe section and the pipe will drop in place within the box as determined by the stack of pipe already there. Preferably, the operator will not drop the pipe from too high above the existing stack of pipe so that the released pipe section does not become diagonally wedged inside instead of conforming to the stack. The process continues until the last pipe section has been withdrawn from the borehole.

In pipe handling device 200, the operator is involved in the process of deciding which pipe to pick up and where to return it. The operator also has to exercise judgment on how far to extend the extension cylinders 244 in order to line up the pipe with the spindle axis, although rotation to that position with the pivoting cylinder is controlled by the pivot adjustment stop 266. Thus, the device is less of an automatic pipe handling device and performs primarily as a mechanical aid to reduce the manual labor involved in the drilling process. The pipe handling device 200, while disclosed to be mounted on the drill unit, could be supported separately from the drill unit. Further, the pipe loader 222 can, itself, be supported separately from the pipe box 202. For example, pipe handling device 200 might be mounted on a pipe trailer positioned next to the drill unit. One can also appreciate that there are multiple ways to implement the rotation and extension/retraction actions performed by cylinders 244 and 270. For example, the two extension cylinders 244 can use the flow divider 306 to cause them to extend equally. This could be accomplished with a pair of timed ball screws, rack and pinion or the like.

In addition, supports can be mounted on the drill unit itself to receive the pipe sections from pipe handling device 200. These supports would be positioned on the spindle axis to align the pipe section directly. These can be configured to swing away or retract when the carriage on the drill unit advances in the drilling process. This would make alignment of axes 24 and 238 less critical and facilitate mounting the device 200 or loader 222 separate from the drill unit.

Among the significant advantages of pipe handling device 200 is its ability to pick up and return a pipe section to any location within the pipe box. The pipe loader 222 is also easily movable from one pipe box to another, an important factor when longer distance boreholes are drilled. Pipe loader 222 can also be used independently of pipe box 202 if a source of pipe sections within reach of the pipe grippers is provided. Further, the pipe handling device 200 lends itself to retrofitting on older drill units already in service. Also, the use of the pivot adjustment stop 266 insures that the extension of cylinders 244, occurring in a single plane approximately intersecting and parallel to the spindle axis 24 means that the operator need only operate this single function to achieve alignment with the spindle axis. This makes the process easier to accomplish. Typically, the extension cylinders will have to have sufficient capability to extend further than the spindle axis because this extended reach is necessary to reach the bottom row of pipe sections in the pipe box.

The Embodiments of FIGS. 23-30

Turning now to FIGS. 23-30, another preferred pipe handling device will be described. The pipe handling device is adaptable for use with any machine or equipment requiring the use or receipt of elongate objects in a generally horizontal position. The pipe handling device, designated generally by the reference numeral 400, may be positioned adjacent the frame of a horizontal boring machine 14, as illustrated in FIG. 24, for storing and laterally transporting pipe sections 18 between the pipe handling device 400 and the horizontal boring machine. The pipe handling device 400 shuttles pipe sections 18 from a storage position to the spindle axis 24 of the horizontal boring machine 14 in a generally horizontal position.

As illustrated in FIGS. 23 and 24, the pipe handling device 400 is adapted to be mounted to the horizontal boring machine 14 via a mounting assembly 402. The mounting assembly 402 facilitates accurate alignment of pipe sections 18 with the horizontal boring machine 14 and connects the frame 404 of the pipe handling device 400 to an adapter or bracket 406 with a plurality of fasteners, such as pins 408. The adapter 406 preferably is welded to the horizontal boring machine 14. Use of the fasteners 408 to removably connect the frame 404 with the adapter 406 allows accurate alignment of the frame 404 with the spindle axis 24. Thus, the pipe loader machine 400 is easily removable from the horizontal boring machine 14 for transport, yet is easily connectable in ready alignment with the spindle axis 24 upon the next use.

The pipe handling device 400 comprises a magazine 414 and a pipe handling assembly 416. The magazine 414 stores a plurality of pipe sections 18 in a manner yet to be described. The pipe handling assembly 416 receives pipe sections 18 from the magazine 414 and transports the pipe sections to the spindle axis 24 of the horizontal boring machine 14 in a manner yet to be described.

With continuing reference to FIGS. 23 and 24, the magazine 414 is situated directly above the frame 404 and preferably is removably connectable therewith. As illustrated in FIG. 23, the magazine 414 may define apertures 420 which correspond with eyes 422 formed in the frame 404. Pins 424 received through the corresponding apertures 420 and eyes 422 secure the magazine 414 to the frame 404.

The magazine 414 defines an open bottom 428 and a plurality of pipe receiving columns 430. This configuration accommodates a plurality of pipe sections 18 which may be stacked in columns of generally horizontal pipe inside the magazine 414. The columns 430 preferably are formed by a pair of opposing ends 434 and 435 defining a plurality of vertical storage structures 436. The vertical storage structures 436 in the opposing ends 434 and 435 correspond to create tracks for receiving the ends 438 and 440 of a pipe section 18 as shown in FIG. 23. The number of columns 430 in the magazine 414 is dependent upon the number of vertical storage structures 436 formed in the opposing ends 434 and 435.

Referring again to FIG. 23, the magazine preferably further comprises a pair of opposing upper bars 444 and a pair of opposing lower brackets 446. The opposing upper bars 444 and the opposing lower brackets 446 help retain the columns 430 of pipe sections 18 inside the magazine 414 and reinforce the structural integrity of the magazine 414.

The magazine 414 may further comprise a handle 450. In the preferred embodiment, the opposing ends 434 and 435 comprise a plurality of recesses 452 adapted to receive a sling-type handle 450. The sling 450 permits the magazine to be lifted and transported. Thus, it will now be appreciated that the magazine 414 is removable and transportable, while the frame 404 remains in an aligned position with respect to the spindle 24 of the horizontal boring machine 14.

With continuing reference to FIG. 23, the magazine 414 may be removed from the frame 404 while either empty or loaded with pipe sections 18. If removed while loaded, pipe sections 18 may be prevented from falling out of the magazine 414 through the open bottom 428 by retaining pins 454. Retaining pins 454 are received through apertures 456 and 457 formed in the opposing ends 434 and 435.

It will now be appreciated that the magazine 414 efficiently stores pipe sections 18 in generally horizontal columns 430 and that the pipe sections 18 are accessible through the open bottom 428 of the magazine.

As illustrated in FIGS. 23 and 24, the pipe handling assembly 416 is situated directly beneath the open bottom 428 of the magazine 414. The pipe handling assembly 416 comprises arms 460 movably supported on the frame 404, and a drive assembly 462 for driving the movement of the arms 460. The arms 460 comprise a pipe holding member 464 formed in the arms 460 proximal the horizontal boring machine 14. The pipe holding member 464 is adapted to receive and support a pipe section 18. The pipe holding member 464 may further comprise a retaining structure 466 for retaining a pipe section 18 in the pipe holding member. In the preferred embodiment, each retaining structure 466 comprises a spring loaded pipe retainer operatively connected to the arm 460 via a spring 468. Retaining structure 466 retains the pipe section 18 in the pipe holding member 464 until the pipe section 18 is aligned with the spindle axis 24.

The arms 460 are positioned on the frame 404 generally parallel with each other. The arms are advanced and retracted laterally and generally perpendicular to the spindle axis 24 of the horizontal boring machine 14 in such a manner as to shuttle pipe sections 18 between the horizontal boring machine and the magazine 414. The extension and retraction of the arms 460 is powered by the drive assembly 462.

The drive assembly 462, illustrated in FIGS. 23 and 24, comprises rack and pinion gear assemblies mounted on the frame 404. A rack and pinion gear assembly is operatively connected to each arm 460 and comprises a pinion gear 474 and a gear rack 476. The rack and pinion gears are mounted in parallel on a shaft 478 which is rotated by a hydraulic motor 480.

The shaft 478 is mounted on the frame 404 generally parallel the spindle axis 24 of the horizontal boring machine 14. The shaft 478 is rotated by the hydraulic motor 480 mounted at one end of the frame 404 (see FIG. 23). The pinion gears 474 are mounted in parallel on the shaft 478 beneath the arms 460. Gear racks 476 are welded to the arms 460.

Operation of the hydraulic motor 480 rotates the shaft 478, which in turn causes the pinion gears 474 to rotate. As shown in FIG. 24, the rotating pinion gears 474 engage the gears racks 476. When the pinion gears rotate in a counterclockwise direction, the arms 460 extend laterally in the direction of the horizontal boring machine 14, designated in FIG. 23 as direction X, thereby transporting a pipe section 18 to the spindle axis 24. The pinion gears may be rotated in a clockwise direction to cause the pipe holding member 464 to retract in direction Y, thereby enabling return of a pipe section 18 to the magazine 414.

The pipe handling assembly 416 preferably further comprises rollers 482, as shown in FIG. 28, to prevent axial sliding of the pipe section 18 while positioned in the pipe holding member 464. When in a normal operating position, the spindle axis 24 is at an angle of approximately ten to twenty degrees with respect to the ground. The pipe handling device 400 is aligned with the spindle axis of the horizontal boring machine 14. Consequently, pipe sections 18 are delivered to and from the spindle axis 24 on an inclined plane. At this angle, pipe sections 18 may slide axially in the pipe holding members 464. To prevent axial sliding, rollers 482 may be supported on the pipe handling device 400 adjacent the pipe holding members 464. The rollers 482 are preferably comprised of a resilient compound which creates a frictional force with the pipe section 18 in the pipe holding member 464, thus creating resistance to slippage. The rollers 482 allow rotation of the pipe section 18, which is necessary to connect and disconnect the pipe from the horizontal boring machine, yet offer sufficient resistance to axial sliding due to their composition.

Turning now to FIGS. 25 through 27, operation of the pipe handling device 400 will be described. To receive a pipe section 18 from the magazine 414, the arms 460 of the pipe handling assembly 416 are retracted to position the pipe holding member 464 beneath the selected column 430 from which a pipe is to be received. Generally, pipe sections 18 first will be retrieved from the column 430 proximal the horizontal boring machine 14 until this column is empty. Thereafter, pipe sections 18 will be retrieved from the immediately adjacent column 430 until it also is empty. Retrieval of pipe sections 18 will proceed in the same fashion until all columns 430 are empty or until the boring operation is completed.

After selecting the desired column 430, the arms 460 are retracted to position the pipe holding member 464 beneath the selected column. The arms 460 are advanced in direction Y by the gear racks 476 and the pinion gears 474. As the arms 460 recede from beneath the desired column 430, gravity causes the pipe section 18 positioned at the open bottom 428 of the selected column 430 to fall into the pipe holding member 464 as illustrated in FIG. 24. The retaining structure 466 is supported by the frame 404 while the arms 460 are in the retracted position beneath the selected column 430. The retaining structure 466 prevents the pipe section 18 from rolling off of the pipe holding member 464.

The arms 460 are then advanced to the spindle axis 24 for connection of the pipe section 18 in the pipe holding member 464 with the drill string of the horizontal boring machine 14. The horizontal boring machine 14 is operated to connect the pipe section 18 to the drill string on the horizontal boring machine 14. Boring operations may then resume.

Referring now to FIG. 26, operation of the pipe handling assembly 416 when receiving a pipe section 18 from the horizontal boring machine 24 will be described. The arms 460 are advanced in direction X to the spindle axis 24. As the arms 460 advance, the spring loaded pipe retainer 466 is deflected downward as it contacts the pipe section 18. The pipe holding member 464 is aligned with the pipe section 18 to be received. After alignment with the pipe section 18, the spring 468 returns the pipe retainer 466 to the support position and retains the pipe section 18 in the pipe holding member 464 during transport. The pipe section 18 is unthreaded from the drill string and is supported solely by the pipe holding member 464. The arms 460 are then retracted in direction Y for return of the pipe section 18 to the magazine 414. Pipe sections 18 are replaced in the magazine 414 in a manner yet to be described.

Preferably, the pipe handling assembly 416 also permits the operator to manually load and unload pipe sections 18 directly to or from the spindle axis 24 without requiring that the magazine be removed from the pipe handling device 400. This is accomplished by retracting the arms 460 to the auxiliary load position illustrated in FIG. 26. The arms 460 are retracted in direction Y to provide sufficient space to manually load or unload pipe sections 18 from the horizontal boring machine 14. When the magazine 414 is emptied and a few additional pipe sections 18 are required to complete the bore, pipe sections 18 may be manually loaded and unloaded while the pipe handling assembly is in the auxiliary load position without removing the magazine 414 from the pipe handling device 400.

Turning now to FIGS. 29 and 30, the pipe handling device 400 preferably further comprises a pipe return assembly 490 for returning pipe sections 18 to the magazine 414. The pipe return assembly 490 is positioned beneath the open bottom 428 of the magazine 414 and comprises return arms 492, pivot pins 494, a link 496 and a hydraulic cylinder 498. The return arms 492 are attached to the frame 404 by pivot pins 494. Link 496 connects the hydraulic cylinder 498 to the return arms 492 by pins 500.

When returning a pipe section 18 to the magazine 414, the first column 430 that is not completely full of pipe sections is selected. The hydraulic cylinder 498 is actuated to extend the link 496 in the direction P. Extension of the link 496 in direction P shifts the return arms 492 thus raising the pipe section 18 into the selected column. Actuation of the hydraulic cylinder 498 causes the link 496 to move in direction P. As the link 496 is extended, the return arms 492 shift position causing the uppermost portion of the return arm to raise. Pipe section 18 supported on the return arms 492 is lifted into the selected column 430. The cylinder 498 is then retracted causing link 496 to move in direction Q. As the link moves in direction Q, the return arms 492 lower. The pipe section 18 in the magazine 414 then rests directly on the arms 460. The arms 460 may then be extended to the spindle axis 24 to receive another pipe section 18 from the horizontal boring machine 14. This sequence is repeated until all the pipe sections 18 from the drill string of the horizontal boring machine 14 are returned to the magazine 414.

It will now be appreciated that the present invention permits automatic loading and unloading of pipe sections between a horizontal boring machine and the magazine of the pipe handling device. The pipe sections are transported in a generally horizontal position and in ready alignment with the boring machine for immediate connection with the drill string. It further will be appreciated that all of the preferred embodiments of the present invention passively position pipe sections in the magazine, or pipe rack, for direct access by the pipe handling assembly. Thus, the present invention permits pipe sections to be retrieved for transport to the horizontal boring machine without the aid of a feeding device which mechanically positions the pipe sections in the magazine for transport to the boring machine.

Although the present invention has been described with respect to a several specific preferred embodiments thereof, various changes and modifications may be suggested to one skilled in the art, and it is intended that the present invention encompass such changes and modifications as fall within the scope of the appended claims. 

What is claimed is:
 1. A pipe handling device for storing and supplying pipe sections for use in a horizontal boring machine having a spindle axis comprising: a magazine having a plurality of columns within each of which a plurality of pipe sections may be received and stored, the magazine having a lower portion having a discharge outlet formed therein; and a pipe handling assembly adapted to transport a pipe section on a delivery path between the discharge outlet of the magazine and the spindle axis of the horizontal boring machine.
 2. The pipe handling device of claim 1 wherein the magazine columns are configured to support pipe sections generally parallel to the spindle axis.
 3. The pipe handling device of claim 2 wherein the magazine columns comprise side plates defining a plurality of vertical storage structures to store pipe sections substantially horizontally within the magazine columns.
 4. The pipe handling device of claim 1 wherein each of the magazine columns is characterized by a lower end, and further comprising at least one column block assembly, independent of the pipe handling assembly and adapted to selectively block discharge of pipe sections from the lower end of an associated magazine column.
 5. The pipe handling device of claim 1 wherein the delivery path includes at least one straight line segment.
 6. The pipe handling device of claim 5 wherein the portion of the delivery path nearest the spindle axis is a straight line segment.
 7. The pipe handling device of claim 6 wherein the pipe handling assembly further comprises: at least one transfer arm; and a pipe holding member structurally linked to the transfer arm.
 8. The pipe handling device of claim 7 wherein the pipe handling assembly further comprises: a rotation member; a hydraulic motor operatively connectable to the rotation member; and at least one gear assembly operatively connectable to the rotation member to drive movement of the transfer arm.
 9. The pipe handling device of claim 8 wherein the gear assembly comprises a rack and pinion gear.
 10. The pipe handling device of claim 8, wherein the gear assembly is rotatably movable to drive movement of the transfer arm.
 11. The pipe handling device of claim 1 wherein each of the magazine columns is characterized by a lower end, and wherein the pipe handling assembly comprises: a transfer arm; a pipe holding member structurally linked to the transfer arm; and wherein the transfer arm is adapted to block discharge of pipe sections from the lower ends of those magazine columns which are more distant from the spindle axis than is the pipe holding member.
 12. The pipe handling device of claim 11 wherein the transfer arm does not block discharge of pipe sections from the lower ends of magazine columns which are closer to the spindle axis than is the pipe holding member.
 13. The pipe handling device of claim 1 wherein each of the magazine columns is characterized by a lower end, and wherein the pipe handling assembly comprises: a transfer arm; a pipe holding member structurally linked to the transfer arm; and wherein the transfer arm does not block discharge of pipe sections from the lower ends of magazine columns which are closer to the spindle axis than is the pipe holding member.
 14. The pipe handling device of claim 11 wherein the pipe holding member of the pipe handling assembly comprises a shelf at an end of the transfer arm, adapted to receive and support a pipe section for transport.
 15. The pipe handling device of claim 14 wherein the pipe holding member of the pipe handling assembly comprises a retaining assembly adapted to maintain positioning of a pipe section on the shelf during transport.
 16. The pipe handling device of claim 1 wherein each of the magazine columns is characterized by a lower end, wherein the pipe handling assembly comprises: a transfer arm having a blocking surface positionable to block the discharge of pipe sections from the lower ends of one or more magazine columns; and a pipe holding member comprising a shelf formed at one end of the transfer arm, the shelf positioned a sufficient distance below the blocking surface to permit reception of a discharged pipe section thereon.
 17. The pipe handling device of claim 16 wherein the shelf of the pipe holding member of the pipe handling assembly is planar.
 18. The pipe handling device of claim 17 wherein the pipe holding member of the pipe handling assembly comprises a pipe retaining assembly adapted to maintain positioning of a pipe section in the pipe holding member during transport.
 19. The pipe handling device of claim 18 wherein the pipe retaining assembly of the pipe holding member is adapted to prevent axial movement of a pipe section supported by the pipe holding member.
 20. The pipe handling device of claim 19 wherein the pipe retaining assembly of the pipe holding member comprises a friction member to prevent axial movement of a pipe section supported by the pipe holding member.
 21. The pipe handling device of claim 20 wherein the pipe retaining assembly comprises at least one movable member adapted to release or retain a pipe section during transfer of the pipe section.
 22. The pipe handling device of claim 21 wherein the retaining assembly further comprises a spring operatively connected to the movable member.
 23. The pipe handling device of claim 21 wherein the retaining assembly further comprises a hydraulically operated piston operatively connected to the movable member.
 24. The pipe handling device of claim 23 wherein the hydraulically operated retaining assembly is movable between an extended position and a retracted position; wherein extension of the piston causes the pipe retaining assembly to be in an open position to receive or release a pipe section; and wherein retraction of the piston causes the pipe retaining assembly to be in a closed position to securely grip a pipe section during transport.
 25. The pipe handling device of claim 5 wherein the delivery path includes at least one arcuate segment.
 26. The pipe handling device of claim 25 wherein the delivery path of the pipe handling assembly includes a straight line segment which is nearer the spindle axis than the arcuate segment.
 27. The pipe handling device of claim 26 wherein the arcuate and straight line segments share a common endpoint.
 28. The pipe handling device of claim 25 wherein the delivery path of the pipe handling assembly includes a straight line segment which is more remote from the spindle axis than the arcuate segment.
 29. The pipe handling device of claim 28 wherein the arcuate and straight line segments share a common endpoint.
 30. The pipe handling device of claim 1 wherein the pipe handling assembly further comprises a pipe return assembly adapted to return a pipe section to the magazine.
 31. The pipe handling device of claim 30 wherein the pipe return assembly comprises a pipe return drive member to drive movement of the pipe return assembly.
 32. The pipe handling device of claim 31 wherein the pipe return drive member comprises a hydraulically operated piston movable between an extended position and a retracted position; wherein extension of the piston raises the pipe return assembly to the bottom of the magazine to return a pipe section to the magazine; and wherein retraction of the piston lowers the pipe return assembly away from the bottom of the magazine to remove a pipe section from the magazine.
 33. The device of claim 1 further comprising a boring machine.
 34. A pipe handling device for storing and supplying pipe sections for use in a horizontal boring machine having a spindle axis comprising: a magazine adapted to receive and store a plurality of pipe sections, the magazine having a lower portion having a discharge outlet formed therein; and a pipe handling assembly adapted to transport a pipe section on a delivery path between the discharge outlet of the magazine and the spindle axis of the horizontal boring machine; wherein the portion of the delivery path nearest the spindle axis is a straight line segment.
 35. The pipe handling device of claim 34 wherein the magazine comprises a plurality of columns to receive and store the pipe sections.
 36. The pipe handling device of claim 35 wherein the magazine columns are configured to support pipe sections generally parallel to the spindle axis.
 37. The pipe handling device of claim 35 wherein the magazine columns comprise side plates defining a plurality of vertical storage structures to store pipe sections substantially horizontally within the magazine columns.
 38. The pipe handling device of claim 37 wherein each of the magazine columns is characterized by a lower end, and further comprising at least one column block assembly, independent of the pipe handling assembly and adapted to selectively block discharge of pipe sections from the lower end of an associated magazine column.
 39. The pipe handling device of claim 38 wherein the pipe handling assembly further comprises: at least one transfer arm; and a pipe holding member structurally linked to the transfer arm; wherein the transfer arm is adapted to block discharge of pipe sections from the lower ends of those magazine columns which are more distant from the spindle axis than is the pipe holding member.
 40. The pipe handling device of claim 39 wherein the transfer arm does not block discharge of pipe sections from the lower ends of magazine columns which are closer to the spindle axis than is the pipe holding member.
 41. The pipe handling device of claim 39 wherein the pipe handling assembly further comprises: a rotation member; a hydraulic motor operatively connectable to the rotation member; and at least one gear assembly operatively connectable to the rotation member to drive movement of the transfer arm.
 42. The pipe handling device of claim 41 wherein the gear assembly comprises a rack and pinion gear.
 43. The pipe handling device of claim 42 wherein the gear assembly is rotatably movable to drive movement of the transfer arm.
 44. The pipe handling device of claim 39 wherein the pipe holding member of the pipe handling assembly comprises a shelf at an end of the transfer arm, adapted to receive and support a pipe section for transport.
 45. The pipe handling device of claim 44 wherein the shelf of the pipe holding member of the pipe handling assembly is planar.
 46. The pipe handling device of claim 45 wherein the pipe holding member of the pipe handling assembly comprises a retaining assembly adapted to maintain positioning of a pipe section on the shelf during transport.
 47. The pipe handling device of claim 46 wherein the pipe retaining assembly of the pipe holding member is adapted to prevent axial movement of a pipe section supported by the pipe holding member.
 48. The pipe handling device of claim 49 wherein the pipe retaining assembly of the pipe holding member comprises a friction member to prevent axial movement of a pipe section supported by the pipe holding member.
 49. The pipe handling device of claim 47 wherein the pipe retaining assembly comprises at least one movable member adapted to release or retain a pipe section during transfer of the pipe section.
 50. The pipe handling device of claim 49 wherein the retaining assembly further comprises a spring operatively connected to the movable member.
 51. The pipe handling device of claim 49 wherein the retaining assembly further comprises a hydraulically operated piston operatively connected to the movable member.
 52. The pipe handling device of claim 51 wherein the hydraulically operated retaining assembly is movable between an extended position and a retracted position; wherein extension of the piston causes the pipe retaining assembly to be in an open position to receive or release a pipe section; and wherein retraction of the piston causes the pipe retaining assembly to be in a closed position to securely grip a pipe section during transport.
 53. The pipe handling device of claim 34 wherein the delivery path includes at least one arcuate segment.
 54. The pipe handling device of claim 53 wherein the delivery path of the pipe handling assembly includes a straight line segment which is nearer the spindle axis than the arcuate segment.
 55. The pipe handling device of claim 54 wherein the arcuate and straight line segments share a common endpoint.
 56. The pipe handling device of claim 53 wherein the delivery path of the pipe handling assembly includes a straight line segment which is more remote from the spindle axis than the arcuate segment.
 57. The pipe handling device of claim 56 wherein the arcuate and straight line segments share a common endpoint.
 58. The pipe handling device of claim 34 wherein the pipe handling assembly further comprises a pipe return assembly adapted to return a pipe section to the magazine.
 59. The pipe handling device of claim 58 wherein the pipe return assembly comprises a pipe return drive member to drive movement of the pipe return assembly.
 60. The pipe handling device of claim 59 wherein the pipe return drive member comprises a hydraulically operated piston movable between an extended position and a retracted position; wherein extension of the piston raises the pipe return assembly to the bottom of the magazine to return a pipe section to the magazine; and wherein retraction of the piston lowers the pipe return assembly away from the bottom of the magazine to remove a pipe section from the magazine.
 61. The device of claim 34 further comprising a boring machine.
 62. A pipe handling device for storing and supplying pipe sections for use in a horizontal boring machine comprising: a magazine having at least one column within which a plurality of pipe sections may be received and stored; and a pipe handling assembly adapted to transport a pipe section to and from the magazine comprising: a transfer arm having a blocking surface positionable to block discharge of pipe sections from the lower end of the magazine column; and a pipe holding member comprising a shelf at one end of the transfer arm, the shelf positioned a sufficient distance below the blocking surface to permit reception of a discharged pipe section thereon.
 63. The pipe handling device of claim 62 wherein the magazine comprises: a plurality of columns to receive and store the pipe sections; and a lower portion having a discharge outlet formed therein to discharge the pipe sections stored in the magazine columns.
 64. The pipe handling device of claim 63 wherein the magazine columns are configured to support pipe sections generally parallel to the spindle axis.
 65. The pipe handling device of claim 63 wherein the magazine columns comprise side plates defining a plurality of vertical storage structures to store pipe sections substantially horizontally within the magazine columns.
 66. The pipe handling device of claim 65 wherein each of the magazine columns is characterized by a lower end, and further comprising at least one column block assembly, independent of the pipe handling assembly and adapted to selectively block discharge of pipe sections from the lower end of an associated magazine column.
 67. The pipe handling device of claim 63 wherein the pipe handling assembly is adapted to transport a pipe section on a delivery path between the discharge outlet of the magazine and the spindle axis of the horizontal boring machine.
 68. The pipe handling device of claim 67 wherein the delivery path includes at least one straight line segment.
 69. The pipe handling device of claim 68 wherein the portion of the delivery path nearest the spindle axis is a straight line segment.
 70. The pipe handling device of claim 69 wherein the pipe handling assembly further comprises: a rotation member; a hydraulic motor operatively connectable to the rotation member; and at least one gear assembly operatively connectable to the rotation member to drive movement of the transfer arm between the magazine and the spindle axis.
 71. The pipe handling device of claim 70 wherein the gear assembly comprises a rack and pinion gear.
 72. The pipe handling device of claim 70 wherein the gear assembly is rotatably movable to drive movement of the transfer arm.
 73. The pipe handling device of claim 62 wherein the shelf of the pipe holding member of the pipe handling assembly is planar.
 74. The pipe handling device of claim 62 wherein the pipe holding member of the pipe handling assembly comprises a retaining assembly adapted to maintain positioning of a pipe section on the shelf during transport.
 75. The pipe handling device of claim 74 wherein the pipe retaining assembly of the pipe holding member is adapted to prevent axial movement of a pipe section supported by the pipe holding member.
 76. The pipe handling device of claim 75 wherein the pipe retaining assembly of the pipe holding member comprises a friction member to prevent axial movement of a pipe section supported by the pipe holding member.
 77. The pipe handling device of claim 74 wherein the pipe retaining assembly comprises at least one movable member adapted to release or retain a pipe section during transfer of the pipe section.
 78. The pipe handling device of claim 77 wherein the retaining assembly further comprises a spring operatively connected to the movable member.
 79. The pipe handling device of claim 77 wherein the retaining assembly further comprises a hydraulically operated piston operatively connected to the movable member.
 80. The pipe handling device of claim 79 wherein the hydraulically operated retaining assembly is movable between an extended position and a retracted position; wherein extension of the piston causes the pipe retaining assembly to be in an open position to receive or release a pipe section; and wherein retraction of the piston causes the pipe retaining assembly to be in a closed position to securely grip a pipe section during transport.
 81. The pipe handling device of claim 68 wherein the delivery path includes at least one arcuate segment.
 82. The pipe handling device of claim 81 wherein the delivery path of the pipe handling assembly includes a straight line segment which is nearer the spindle axis than the arcuate segment.
 83. The pipe handling device of claim 82 wherein the arcuate and straight line segments share a common endpoint.
 84. The pipe handling device of claim 81 wherein the delivery path of the pipe handling assembly includes a straight line segment which is more remote from the spindle axis than the arcuate segment.
 85. The pipe handling device of claim 84 wherein the arcuate and straight line segments share a common endpoint.
 86. The pipe handling device of claim 62 wherein the pipe handling assembly further comprises a pipe return assembly adapted to return a pipe section to the magazine.
 87. The pipe handling device of claim 86 wherein the pipe return assembly comprises a pipe return drive member to drive movement of the pipe return assembly.
 88. The pipe handling device of claim 87 wherein the pipe return drive member comprises a hydraulically operated piston movable between an extended position and a retracted position; wherein extension of the piston raises the pipe return assembly to the bottom of the magazine to return a pipe section to the magazine; and wherein retraction of the piston lowers the pipe return assembly away from the bottom of the magazine to remove a pipe section from the magazine.
 89. The device of claim 62 further comprising a boring machine.
 90. A method for handling a plurality of pipe sections at a horizontal boring site having a spindle axis comprising: storing the plurality of pipe sections in plural columns of a multiple-column magazine; discharging a single pipe section from a first selected magazine column and transporting that pipe section to the spindle axis; adding the transported pipe section to the drill string of a horizontal boring machine; repeating the preceding two steps until all pipe sections have been emptied from the selected column; repeating the preceding three steps with one or more additional selected columns, with the sequence by which columns are emptied defining a column emptying order; removing a pipe section from the drill string of the horizontal boring machine; transporting the removed single pipe section from the spindle axis to the magazine column which is last in the column emptying order, and storing that pipe section in the magazine column; repeating the preceding two steps until all pipe sections which had been removed from the selected column have been replaced; repeating the preceding three steps with one or more additional selected columns, with the sequence in which columns are refilled defining a sequence which is the reverse of the column emptying order.
 91. The method of claim 90 further comprising preventing axial movement of the pipe section during transport to the spindle axis.
 92. The method of claim 90 further comprising emptying the columns in order of column proximity to the drill string.
 93. A method for handling a plurality of pipe sections at a horizontal boring site having a spindle axis comprising: storing the plurality of pipe sections in plural columns of a multiple-column magazine; discharging a stored pipe section from a first selected magazine column; and transporting a discharged pipe section along a delivery path between the magazine and the boring machine; wherein the segment of the delivery path nearest the boring machine comprises a straight line segment. 